Drill chuck

ABSTRACT

A drill chuck having a sleeve for reception of a drill shank through a central hole in its front end into a body part received into the sleeve, the body part having mutually slidable gripping members provided with apertures into which the shank is received and retained by means of adjustable screws in the slidable member. The sleeve protectively covers over the screws; and the body part is adapted for attachment to a driving spindle. In a modified form the sleeve may be of plastics material, which the body may be of plastics, or rubber material.

United States Patent 11 1 Derbyshire Aug. 7, 1973 DRILL CHUCK 2,324,1307 1943 Beckwith 279/18 1,772,495 8/1930 Powell 1 1 279/1 Q [75] InventGeorge Derbyshm, 3,610,641 10/1971 Ryder 279/1 0 Sheffield, England [73]Assignee: The Jacobs Manufacturing Primary Examiner-Andrew R. JuhaszCompany, Limited, Sheffield, Assistant Examiner-Z. R. Bilinsky EnglandAtt0rney--Stephen J. Rudy [22} Filed: Nov. 22, 1971 [57] ABSTRACT [21]App1.No.:201,090

A drill chuck having a sleeve for reception of a drill shank through acentral hole in its front end into a body [30] Apphcatlon P Data partreceived into the sleeve, the body part having mu- May 13, 1971 UnitedKingdom 14,870/71 tually slidable gripping members provided withapertures into which the shank is received and retained by Cl 279/1279/1 Q, means of adjustable screws in the slidable member. The 279/84,sleeve protectively covers over the screws; and the [51] Int. Cl B231)31/04 body part is adapted for attachment to a driving spin- [58] Fieldof Search 279/84, 86, l C, dle.

namo11e ormteseeve ma e0 astlcs t'lh'hth d b flt', bb References Cited2222;, w 1c e b0 y may e ov p as 168 or ru er UNITED STATES PATENTS820,263 5 1906 Schmid et a1. 279/18 Clam, 12 Drawmg Flgums 715,25212/1902 Errington 942,304 12/1909 Bomborn et a1. 279/18 PMENIEM3.7519052 sum 1 0r 2 IN'VENTOR GEORGE C a DERBYSHIRE ATTORNEY PAIENIEW3.751.052

sum 2 0F 2 E QQ J 6 F/GG INVENTOR GEORGE C.I DERBYSHIRE BY w ATTORNEYDRILL cnucx BACKGROUND OF THE INVENTION The invention relates to drillchucks and has for its object to provide an improvement therein.

According to the invention, there is provided a drill chuck including abody part, a pair of gripping members movable therein in mutuallyperpendicular directions, each gripping member comprising an aperturedmember capable of receiving a drill shank in its aperture and a screwfor retaining the drill shank in said aperture, and a sleeve surroundingsaid body part and provided with radial holes to permit adjustment ofthe screws in the apertured members, said sleeve being a snap fit onsaid body part. Preferably, the gripping members are slidably mounted inthe body part in mutually perpendicular diametrical channels. Preferablyalso, the sleeve will be a snap fit on the body part in such a positionthat the radial holes will be in alignment with the screws in theapertured members and this may be arranged by projections within thesleeve being received in the other extremities of the channels in whichthe gripping members are slidable. On the other hand, however, thiscould be arranged by a locking key being formed within the sleeve andengaging a groove extending longitudinally along the periphery of thebody part. The sleeve surrounding the body part may be formed integrallywith an end plate having a central hole through which a drill shank mayextend. Said sleeve and integral end plate may be made of a syntheticplastics material and in this case the central hole will preferably beprovided with a metal liner peened over inside and outside the endplate. The body part may also be made in part of a synthetic plasticsmaterial but in this case will be provided witha metal spigot dr nut forits ready connection to a machine tool or hand tool or the like. In thiscase also, mutually perpendicular diametrical channels may be mouldeddirectly in the synthetic plastics material for the gripping members tobe slidable therein; alternatively, however, the gripping members, whichare of metal, may be moulded in the synthetic plastics material of whichthe body part is at least in part formed, although in this case it willbe preferable for the synthetic plastics material to be surrounded by ametal casing or for a metal end portion of said body part to be providedwith metal dogs which project into themass of synthetic plasticsmaterial or bonded rubber to support it.

BRIEF DESCRIPTION OF DRAWING In order that the invention may be fullyunderstood and readily carried into effect, the same will now bedescribed, by way of example only, with reference to the accompanyingdrawings, of which: I

FIG. I is a perspective exploded view of a drill chuck embodying theinvention;

FIG. 2 is a cross-section on'the line II--II in FIG. ll;

FIG. 3 is a cross-section on the line III--III in FIG. 2;

FIG. 4 is a cross-section on the line IV-IV in FIG. 3; and

FIGS. 5 to 12 are scrap views which will presently be referred to whenpossible modifications are being described.

DESCRIPTION OF PREFERRED EMBODIMENTS Referring now to FIGS. 1 to 4 ofthe drawings, these illustrate a drill chuck which includes a body part,gen

erally indicated l0, and a pair of gripping members 12 and 14 which areslidable therein in mutually perpendicular diametrical channels I6 and118. The channel 16 is shallower than the channel 18 and the arrangementis such that, when mounted in their channels, the grip ping member 12overlies the gripping member 14.

As perhaps best shown in FIG. 1, each gripping member comprises anapertured member capable of receiving a drill shank in its aperture,which is partly of V- form, and a grub screw 20 for retaining the drillshank in said aperture and for imparting rotation thereto as the chuckrotates. The arrangement is such that whatever size of drill is mountedin the chuck, within the capacity of the chuck of course, the drillassumes a position at the axis of the body part by virtue of thediametrical location of the gripping members. A dimple II is formed atthe bottom of the channel l8,.at the axis of the body part, to assist inlocating a drill shank at the axis of rotation.

A sleeve 22 made of a synthetic plastics material surrounds the bodypart and hides the gripping members from view. It also prevents thecomplete extraction of the grub screws 20 since although it is providedwith radial holes 24 through which a suitable key can be inserted forthe adjustment of the screws, said holes are not sufficiently large toallow the passage of said screws. (A suitable key for engaging the grubscrews is shown in chain-dotted lines in FIG. 2.) Consequently, there isno danger of an operative being able to do himself an injury bygraspingthe chuck before it has quite stopped if by chance one of thegrub screws has worked loose during service.

The sleeve 22 is formed integrally with an end plate 26 having a centralhole 28 through which a drill shank may extend. The hole 28 is providedwith a metal liner 30 which is peened over inside and outside the .endplate as shown in FIG. 3;.this protects the end plate from damage if itshould briefly come into contact with a workpiece as a drill breaksthroughTit.

The sleeve is a snap fit on the body part in such a position that theradial holes 2 1 are in alignment with the screws 2t). The snap fit isobtained by an in-turned bead 32 which is formed at the end of thesleeve remote from the end plate and which snaps over the end of thebody part. The angular location of the sleeve on said body part isbrought about by projections 34 which have been moulded within thesleeve and which are received in the outer extremity of one of thechannels in which the gripping members are slidable.

It will be observed that the body part It) is provided with a spigot 36with a threaded bore 38 so that the chuck can be mounted upon an arborand used on a machine too]. However, it will be understood thatdepending upon the particular market for which the chuck is intended, itmay have other mounting means. For example, the body part coulcl have anexternally threaded spigot or could even be provided with a Morse taper"spindle or power tool spindle, i.e., a straight shank.

Referring now to FIGS. 5 and 6, in a modification of the chuck justdescribed, the body part 10 has been formed largely of a syntheticplastics material with the channels 16 and 18 moulded in it. The bodypart has been moulded around a threaded end of a 'metal adaptor element40 (threading being a convenient method of obtaining a good key in thesynthetic plastics). An annular flange M which is formed on the adaptorelement has peripheral indentations 44 which provide a further keybetween the adaptor element and the main mass of material forming thebody part. The adaptor element is provided with a spigot portion 46having an external screw-thread for its connection to a power tool.

In FIG. 7, there is illustrated a construction similar to that justdescribed except that the adaptor element, instead of having ascrew-threaded spigot portion, is hollow and has an internalscrew-thread 48 for its connection to a different type of power tool.

Referring now to FIGS. 8 and 9, in a further possible modification, thebody part is formed largely of bonded rubber 50 within which thegripping members 112 and 14 are slidably mounted in the channels whichhave been moulded in said body part. A metal casing 52 surrounds thebonded rubber and is provided with an integral spigot portion 54 whichhas an external screwthread for its connection to a power tool. (But, asin the case of the chucks previously described, it could have any otherform of mounting means desired.) This construction is particularlysuitable for giving a cushioning effect when impact drilling.

In FIGS. 10, 11 and 12, there is illustrated a construction of body partsimilar in some respects to that just described with reference to FIGS.8 and 9; that is to say, the gripping members 12 and lll are slidablydisposed within a mass of bonded rubber which serves to give acushioning effect when impact drilling. However, in this case, jawguides 56 of channel section shown in perspective in FIG. 12, have beenpressed into channels moulded in the rubber and the gripping members areslidable in said guides in mutually perpendicular directions. Said jawguides are each provided with a central hole through which the shank ofa drill can extend.

Various other modifications may, of course, be made without departingfrom the scope of the invention.

What is claimed is:

ll. A drill chuck including a body part, a pair of gripping membersmovable therein in mutually perpendicular relation, each gripping membercomprising an apertured member capable of receiving a drill shank in itsaperture and a screw for retaining the drill shank in said aperture, anda sleeve surrounding said body part and provided with radial holes topermit adjustment of the screws in the apertured members, said sleevehaving a snap fit on the body part, wherein the sleeve is formed ofsynthetic plastics material having a coned head provided with a centralhole adapted for reception of the shank of a tool, the hole being fittedwith a metal liner projecting at one end beyond the outer face of theconed head.

2. A drill chuck as in claim 1, wherein the gripping members areslidably mounted in the body part in mutually perpendicular diametricalchannels.

3. A drill chuck as in claim 1, wherein the sleeve surrounds the screws,and the radial holes are relatively smaller in diameter than the screwsso as to prevent escape of the screws from the gripping members throughthe radial holes.

4. A drill chuck as in claim 3, wherein internal projections formed inthe sleeve are slidably received in the channels, and the radial holesare so located in the sleeve as to be aligned radially with the screwswhen the projections of the sleeve are so received.

5. A drill chuck as in claim 3, wherein the end of each screw is formedwith a cavity adapted to accommodate an adjusting tool passed through arelated radial hole.

6. A drill chuck as in claim 1, wherein the body part is formed with aperipheral step and the sleeve is provided with an inturned bead havinga snapped engagement with the peripheral step.

7. A drill chuck as in claim R, wherein the body part is adapted at itsrear end for attachment to a driving spindle. I

' b. Adrill chuck including a body part, a pair of gripping membersmovable therein in mutually perpendicular relation, each gripping membercomprising an apertured member capable of receiving a drill shank in itsaperture and a screw for retaining the drill shank in said aperture, anda sleeve surrounding said body part and provided with radial holes topermit adjustment of the screws in the apertured members, said sleevehaving a snap fit on the body part wherein the gripping members areslidably mounted in the body part in mutually per pendicular diametricalchannels, and wherein the body part comprises a core of rubber materialencased in a metal sleeve having a wall backing the core and adapted forattachment to a driving spindle.

9. A drill chuck as in claim 8, wherein the channels are lined withmetal guides for the gripping members.

lltl. A drill chuck as in claim l, wherein the sleeve has a central holefor axial reception of drill shank and the body has a dimple axiallyaligned with the hole for centering the drill shank relative to thegripping members.

1. A drill chuck including a body part, a pair of gripping membersmovable therein in mutually perpendicular relation, each gripping membercomprising an apertured member capable of receiving a drill shank in itsaperture and a screw for retaining the drill shank in said aperture, anda sleeve surrounding said body part and provided with radial holes topermit adjustment of the screws in the apertured members, said sleevehaving a snap fit on the body part, wherein the sleeve is formed ofsynthetic plastics material having a coned head provided with a centralhole adapted for reception of the shank of a tool, the hole being fittedwith a metal liner projecting at one end beyond the outer face of theconed head.
 2. A drill chuck as in claim 1, wherein the gripping membersare slidably mounted in the body part in mutually perpendiculardiametrical channels.
 3. A drill chuck as in claim 1, wherein the sleevesurrounds the screws, and the radial holes are relatively smaller indiameter than the screws so as to prevent escape of the screws from thegripping members through the radial holes.
 4. A drill chuck as in claim3, wherein internal projections formed in the sleeve are slidablyreceived in the channels, and the radial holes are so located in thesleeve as to be aligned radially with the screws when the projections ofthe sleeve are so received.
 5. A drill chuck as in claim 3, wherein theend of each screw is formed with a cavity adapted to accommodate anadjusting tool passed through a related radial hole.
 6. A drill chuck asin claim 1, wherein the body part is formed with a peripheral step andthe sleeve is provided with an inturned bead having a snapped engagementwith the peripheral step.
 7. A drill chuck as in claim 1, wherein thebody part is adapted at its rear end for attachment to a drivingspindle.
 8. A drill chuck including a body part, a pair of grippingmembers movable therein in mutually perpendicular relation, eachgripping member comprising an apertured member capable of receiving adrill shank in its aperture and a screw for retaining The drill shank insaid aperture, and a sleeve surrounding said body part and provided withradial holes to permit adjustment of the screws in the aperturedmembers, said sleeve having a snap fit on the body part wherein thegripping members are slidably mounted in the body part in mutuallyperpendicular diametrical channels, and wherein the body part comprisesa core of rubber material encased in a metal sleeve having a wallbacking the core and adapted for attachment to a driving spindle.
 9. Adrill chuck as in claim 8, wherein the channels are lined with metalguides for the gripping members.
 10. A drill chuck as in claim 1,wherein the sleeve has a central hole for axial reception of drill shankand the body has a dimple axially aligned with the hole for centeringthe drill shank relative to the gripping members.